so my hadley semi horn only sounds at 60 psi or less is somthing wrong with it or is that normal. above 60 psi it just sounds like air blowing through.
I used a 1/2in valve (from my old k3ha set up) running through a 1/4in id air hose (2ft long) to a 1/4in barb to 1/8in fitting into the horn.
its a 26in long rectangle horn says Mack on the front
I would assume that’s normal as I don’t think many semi trucks really go above that in pressure. Before you take what I say as truth, I’d wait and let a couple of other people more familiar with semis give an opinion.
it might have something wrong with the diaphragm but I may not be so sure. I had tried running a couple horns that used a on-demand compressor (~7psi) and ran it at 125psi and it still worked… very loudly.
The air horns on my Western Star semi blow at 120-125 psi. I think there may be something wrong with your horn if it does’nt blow above 60 psi. Most semi’s run 120psi as compressor cutout pressure.
[QUOTE=mercer;35400]The air horns on my Western Star semi blow at 120-125 psi. I think there may be something wrong with your horn if it does’nt blow above 60 psi. Most semi’s run 120psi as compressor cutout pressure.[/QUOT
I wonder if my line is to big or if semi horn valves only allow so much pressure. It sounds fine to me at 60psi thats the only reason I think something may not be wrong with it, but I will take it apart tomorrow and see if it looks like (dont know y I never did that before)
My stock horns only have 1/4" line running to them. You might be right about the valve only allowing so mch pressure. I know I increased the cutout pressure on my commpressor from 120 to 130 in preparation for my P3 arrival and my stock horns sounded louder at 130 than 120. I would try your horn with another valve maybe? I’m pretty sure if that horn came off a Mack it should be able to handle 120psi no prob.
well I may have found it. I took my horn off my truck to look at it. and as I was taking off the fitting going into the horn it fell out of the horn (no unscrewing) The horn was striped wen I got it but I found a fitting that was long enough to get to the good threads. I did some looking around and found that other one that I was supost to use. so I used that wrong one on the install.
I shall try that and get back to you guys
Have you tried to adjust the back cap for tuning? Or if you have blow by Diaphragm could be stuck or damaged. Are they the round or square bells?
Here ya go. http://www.hadley-products.com/catalog/Catalog.aspx?cmd=prd&div=3&cat=55&prd=164
Good luck,
John
so I hooked it back up I used epoxy to make sure it had a good air tight seal. no luck.
I opened up the back and it looked fine but I guess I cant tell if the diaphragm is worn by looking at it.
hear is a video of it
thanks. what do u mean by adjusting the back cap I dont think you can. there is just the diaphragm sitting in there is the back cap against it and I put the secures back until they stopped (did not force them when they got tight)
square bell
On some semi horns the bell can be turned in and out for tuning. Hold the back cap and turn the bell. Well I’m gonna say the diaphragm is shot.
By the sound of them in your vid I’d agree with Jersey, you need a new diaphram.
are u sure cause it sounds good at 60 psi I made a new video it starts the same as the other one but has the horn at 60 psi after. it was loud to not like train horn loud but a little louder than a car horn
well i stand corrected. Usually when a diaphragm goes bad or sticking you get blow by. You might be over powering it with the 5/8" air line. I would try increasing psi in small amounts. until you have no blow by. I have a set of grover shutter tones and run them at 100 to 120 psi. Let us know how you make out. What model are they?
John
Well I just got done doing some reading on the Hadley site. All their run 110/135 pressure switches. So form reading your sig your set up runs 150 psi. Being that you had a K3 I would assume you are running that Psi. I believe you are over powering that horn. Or diaphragm is still bad.
Is it possible that the diapragm has a tiny crack which at a low pressure would not affect the operation of the horn but once normal operating pressure is apllied results in failure? Have you removed and inspected the diapragm thoroughly?
I still have the k3 I just switched to a graham white valve (I have not been on in awhile so have not updated it) I ran 1/4id hose between the 1/2in electronic valve and the horn.
I saw that too that there compressor setups have 135psi switches.
idk I just dont get it. it sounds good at 60 psi so mabe I should just be happy with that and get a regulator (or use a ball valve as one)
not very thoroughly but I did look at it for a few seconds both sides I did not see any thing
A good cleaning with some brake clean or just soap and water?
worth a I try I guess it was not that dirty just a couple rings where it touched the horn